kangueryensis: Paraguay (Itapúa); Type locality: Kangüery, privately-owned reserve by Guyra Paraguay within the area delimited for the implantation of the San Rafael National Park, district of Alto Vera, Itapúa Department (26°30’42”S, 55°47’20”W).

Description: Atractus thalesdelemai can be distinguished from all congeners by the combination of a single postocular, long loreal, six supralabials, generally six infralabials, 17 dorsal scale rows, six or seven maxillary teeth, and a dorsal color pattern in preservative uniformly grayish-brown with a creamish-white temporal region.

Diagnosis (kangueryensis): Atractus kangueryensis differs from A. albuquerquei, A.canedi, A. paraguayensis, A. reticulatus, and A. taeniatus by a higher number of dorsal scale rows (17 instead of 15); from A. reticulatus, A. serranus, A. trihedrurus, and A. snethlageae by a greater number of ventral scales (130-166 instead of 165-169); and from A. albuquerquei by a lower number of ventral scales (170-200 instead of 165-169). Additionally, it can be distinguished from A. albuquerquei and A. canedi by a lower number of sub-caudal scales (27-50 instead of 22-25); from A.paraguayensis, A. serranus, A. taeniatus, A. trihedrurus and A. snethlageae by a lower number of supralabials (7-8 instead of 6); and from A. canedi, A. pantostictus, A. paraguayensis, A. serranus, A. snethlageae and A. zebrinus by a lower number of infralabials (7-8 instead of 6). Finally, the color pattern of the new species is distinct from that of Atractus kangueryensis from A. canedi, A. paraguayensis, A. reticulatus, A. serranus, A. taeniatus, A. thalesdelemai, A. snethlageae and A.zebrinus.

Etymology (kangueryensis): The specific epithet “kangueryensis” is a proper noun from the type-locality. It comes from the Guarani language and means “water coming from the bones” (Kangue: bone; ry: liquid, water), in reference to a place where the tribe MbyaGuarani buried their members. It is also the name of a stream that flows 2000 m far from the location where the holotype was collected.